LibTorch

red links against the PyTorch C++ distribution (LibTorch). The CPU build is sufficient.

Download

From the PyTorch download page, select:

• OS: Linux
• Package: LibTorch
• Language: C++ / Java
• Compute Platform: CPU

Download the resulting zip.

Install

Unzip into red/lib/:

cd ~/src/red
unzip ~/Downloads/libtorch-*.zip -d lib/

Result:

red/lib/libtorch/
├── bin
├── include
├── lib
└── share

red's CMakeLists.txt references ${CMAKE_SOURCE_DIR}/lib/libtorch — no further config needed.